Cutting-off attachment for sewing-machines.



A. S. ROBINSON.

CUTTING OFF ATTACHMENT FOR SEWING MACHINES. APPLICATION FILED DECJB. I9I7.

1,286,1 1 s. PIIEI IGII NOV. 26,1918.

' j I INVENTOR.

1H quzZaS. Robinson.

UNITED STATES PATENT OFFICE.

LQUILA. S. ROBINSON, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO METRO- POLITAN SEWING MACHINE COBPORATION,-A CORPORATION OF DELAWARE.

CUTTING-OFF ATTACHMENT FOR SEWING-MACHINES.

To all whom it may concern:

'Be it known that I, AQUILA S. ROBINSON, a citizen of the United States, residing at Philadelphia, in the county of Philadelphia, and State of Pennsylvania, have invented certain new and useful Improvements in Cutting-Off Attachments for Sewing-Machines, of which the following is a specification.

This invention relates to. cutting attachments for sewing machines, th ob'ect of the invention being to provide a simpie and effective cut-ting attachment that can readily be applied to the work or cloth plate of any sewing machine, so that as the work is stitched by the machine it may be out in any desired lengths by a simple manipulation of a foot treadle or knee shift.

Another object of the invention is thepro vision of an improved cutting attachment, so located on the work or cloth plate of a sewing machine in the rear of the stitching and feeding mechanism, that it may be readily adjusted relative to the line of feed and also at right angles to the line of feed, so that the depth of the cut effected by the cutting members can be regulated whereby certain portions of the goods may be cut or notched without the necessity of cutting other portions thereof, so that the cutting attachment may be used either to cut a; gash or notch in the edge of the goods beingstitched or used to cut 011 strlps as they are stitched. I

Heretofore it has been the usual custom to run a number of connected garmentsfsey a dozen,--one after another, letting them pile up in the rear of the machine, which more or less retarded the handling and feeding of the work, and after the completion of a dozen garments theoperator would separate them by the use of scissors or shears.

The object of the present improvement however, is to provide a very simple and;

eflicient cutting attachment which will separate the articles as they are stitched by the sewing machine, and is particularly useful where continuous top or top and bottom strips are applied to the edge of a garment, such as button stays, button hole facing, drawer bands, etc., wherein as each garment is passed into the machine to be stitched,,

and as the stitching operation is completed, the cutters may be actuated by the movement of the foot or knee of the operator, and so Specification of Letters Patent.

Patented.Nov. 26, 1918.

Application filed December 18, 1917. Serial No. 207,765.

garments may be separated so that each garment maybe removed from the rear of the machine as it is finished.

In the drawings accompanying and forming a part of this specification,

Figure 1 is a top view of this improved cutting attachment applied to the work plate Of a sewing machine, only so much of the presser foot and stitching mechanism as is deemed necessary to clearly illustrate the invention being shown; Fig. 2 is a view of the attachment looking in the direction of the arrow, Fig. 1; Fig. 3 is an end view of the attachment looking in the direction of the arrow A in Fig. 1; Fig. 1 is a sectional view of the bottom knife or cutter taken on the line H of Fig. 3; Fig. 5 is a sectional view of the swinging knife taken on the line 55, Fig. 3-; and Fig. 6 is a perspective detail view of the segmental gear teeth carried by the swinging knife and by the shaft for operating said knife.

Similar characters of reference indicate corresponding parts in the several figures of the drawings.

In the preferred form thereof herein shown, the work plate 1, the presser foot 2, the needle holes 3 through which the needles pass to effect the stitching illustrated at 4, may be of the usual construction so that a detail description thereof is deemed unnecessary. A facing strip 5 and a lining strip 6 are shown passing under the presser foot, and serve to illustrate how these strips of fabric pass through the stitching mechanism to'the cutting mechanism. about to be described.

This itnproved cutting attachment comprises a bracket 7, rovided with two elongated slots 8 throng which attaching screws 9, having lock nuts and washers 9"]and 9", pass to secure the bracket to the work plate, and the work plate 1 is also provided with elongated slots lOextending at right angles to the slots 9, thus providing means for adjusting the bracket 7 in either direction, that is, to and from theli'ne of feed and also at right angles thereto in a manner which will be readily understood. This bracket 7 is provided with two upright bearings 11 spaced apart and in these hearings is located a. rock shaft 12, to one end of which is secured by means of a pin let a lever 15, which lever is connected by a rod 16 with a floor 66 severed from the strips, whereby the several treadle 17 or its equivalent, such as a knee MM C093 Memes eeeYj mechanism, cutand operi fea, and

emming knife alwa'v frdm the finediknife and wswing mechanism, so that the wgorlkmvillalibzishly iitziehd te fihewerk ipl eef'a 'se'wing mehinf'ei gear 1 teeth", mid means for heated 'te eperete ae an engle 1: 0 'th'e1- zmea-ns cfor-f c'ipmting it i and also have line of feed and comprising a bracket, a rock shaft carried thereby, a segmental gear carried by said shaft, means for operating said shaft, a fixed knife, a swinging knife pivotally secured to said bracket and also having segmental gear teeth meshing with the segmental gear carried b the rock shaft, and a spring carried by said shaft for maintaining the swinging knife away from the fixed knife.

9. A cutting attachment for a sewing machine located to operate at an angle to the line of feed and comprising a bracket, a rock shaft carried thereby, a se mental gear carried by said shaft, means or operating said shaft, a fixed knife, and a swinging knife pivotally secured to said bracket and formed with segmental gear teeth meshing with the segmental gear carried by the rock shaft, said fixed knife having a thin front edge and a raised cutting edge and said swing-in knife having a concaved front side and an inclined rear side. 10. A cutting attachment for a' sewing machine comprising a bracket, a rock shaft carried thereby, means for rocking said shaft, a se mental gear carried at the op 0- site end of said shaft, a fixed knife carried, by said bracket and projecting forwardly thereof transversely of the line of feed of the sewing machine, a swinging knife pivota'lly securedto said bracket and also having segmental gear teeth meshing with the segmetal gear, said bracket having a pair of upstanding walls forming a recess between which said segmental gear teeth and the rear end of the swinging knife are located.

11. A cutting attachment for a sewing machine comprising an adjustable bracket adjustable in different directions, a rock shaft carried by said bracket, means at one end thereof for rocking said shaft, a pair of upstanding walls carried by said bracket, a segmental gear at the opposite end of said rock shaft and located between said walls, a

fixed knife carried by the bracket and extending across the line of feed of the work, a swinging knife pivotally secured to the bracket and having at its rear end segmental gear teeth cooperating with the segmental gear and also located between said upstanding walls, a fixed knife having a thin front edge and a raised rear cutting edge with a relief portion adjacent thereto, the swinging knife having a concaved front side and an inclined rear side, and a spring carried by said rock shaft for maintaining the swinging knife away from the fixed knife. 12. A cutting attachment for sewing machines comprising a fixed knife extending across the line of feed of the work, a swinging knife cooperating therewith, means including gearing for operating said swinging knife, and upstanding walls inclosing said gearing and protecting the work therefrom.

' 1 A cutting attachment for sewin machines located at an angle to the line 0 feed and comprising a bracket having a pair of upstanding protecting walls forming a recess therebetween, a fixed knife and a swingchines located at an an 'le to the line of feed and comprising a bracket having a pair of upstanding protecting wallsforming a recess therebetween, a fixed knife and a swinging knife, the latter pivotally secured to said bracket, means for operating said swinging knife and comprising gea nng located between said upstanding walls, and means for maintaining the swinging knife away from the fixed knife. i 1 i I 15. A cutting attachment-for. sewi machines located at an" angle tothe line, 0 feed and comprising a bracketgharing a-;pair of upstanding protectingwal'lsforming a re cess therebetween, a fixed knife and a swinging knife, the latter pivotally secured to said bracket, means for operating said swinging knife and comprising a gearing located between said upstanding walls, means for maintaining the swinging knife away from the fixed knife, and means for adjusting the bracket in directions transverse to each other toward and from the work.

Signed at Philadelphia, Pennsylvania, this 11th day of December, 1917.

AQUILA S. ROBINSON. 

